A reptile that hugs you is only looking for your warmth or tries to eat you.

Kleptothermy, theft of warmth, is a form of thermoregulation. It occurs in a wide variety of animal species, including human. For example when we cuddle up because it's cold.

Reptiles* cannot create body heat themselves. Their metabolism is dependent on external heat sources.

When your reptile hugs it body against you, it certainly feels safe. But it doesn't do it out of affection, but because you are warm.

It's still a nice feeling.

You should always keep in mind, that it's better for the animal not to take it out of the terrarium.

My leopard geckos are about to winter rest. I initiate a near-natural rest at a temperature of around 12°C.
It's important to get an accurate picture of the animals health beforehand. This includes taking fecal samples, scanning the body for abnormalities and assessing the strength of the animal.

*From a cladistic point of view, which is the scientific standard today, the reptiles as a monophyletic taxon, i.e. as a natural (complete) descent group (Reptilia as clade), should at least also contain the birds, which are warm-blooded.